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Paul could not have told us any plainer concerning that Israel of the flesh, than follows:
Romans 9:27-29 (TNIV)
27 Isaiah cries out concerning Israel: “Though the number of the Israelites be like the sand by the sea,
only the remnant will be saved.
28 For the Lord will carry out his sentence on earth with speed and finality.”
29 It is just as Isaiah said previously: “Unless the Lord Almighty had left us descendants, we would have become like Sodom, we would have been like Gomorrah.”
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God's end goal is:1 Corinthians 1:29 “... no flesh should glory in his presence.” (KJV)
It is man's glorying in his flesh that gets man into his deepest troubles and steals man's mind away from obedience to God. Man's flesh quickly becomes like a false idol between man and God. God is showing no respect toward men on the basis of their flesh and it's fleshly ties, even as Peter, Paul, and James told us. God is rewarding the spirit of faith, regardless of anyone's fleshly descent.
Romans 3:19-26
19 “Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God.
20 Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
21 But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets;
22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
23 For all have sinned, and come short of the glory of God;
24 Being justified freely by his grace through the redemption that is in Christ Jesus:
25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;
26 To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.” (KJV)
Paul presents a clear distinction between the true spiritual Israel of God (Galatians 6:16) and Israel of the flesh (1 Corinthians 10:18). There would be no need for Paul to speak of it as if separate from the one way of Christ, calling it Israel of the flesh, but that the true Israel of God is not of the flesh.
The lost sheep of the house of Israel were being attended to by Jesus' ministry. The lost sheep are that remnant God is saving:
Matthew 10:5-6
5 “These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not:
6 But go rather to the lost sheep of the house of Israel.”
Jesus saw the true Israel of God as one by spirit in the hearts of men and he began that Israel:
Luke 1:15-17
15 “For he shall be great in the sight of the Lord, and shall drink neither wine nor strong drink; and he shall be filled with the Holy Ghost, even from his mother's womb.
16 And many of the children of Israel shall he turn to the Lord their God.
17 And he shall go before him in the spirit and power of Elias, to turn the hearts of the fathers to the children, and the disobedient to the wisdom of the just; to make ready a people prepared for the Lord.” (KJV)
Remember as to verse 16, there, “And many of the children of Israel shall he turn to the Lord their God”, that Paul said:
Romans 9:6-8
6 “Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
8 That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.” (KJV)
Those of flesh and blood Israel who never do wake up from the blindness, don't wake up from it because they were never the true Israel by the spirit of faith in their hearts. They have not the faith as Abraham, Isaac, and Jacob and that means they have disowned Abraham, Isaac, and Jacob as their fathers. We see that in how they disowned God as their Father:
Deuteronomy 32:5 “They have corrupted themselves, their spot is not the spot of his children: they are a perverse and crooked generation.”
John 8:19 “Then said they unto him, Where is thy Father? Jesus answered, Ye neither know me, nor my Father: if ye had known me, ye should have known my Father also.” (KJV)
John 8:39 “They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham.” (KJV)
That brings us to the final points of Romans 11 which are often misused to support the idea that it is flesh and blood Israel rather than the spiritual Israel that Paul says will be saved at Romans 11:32.
These next four verses must be considered together to grasp what is said in verses 12 and15. One cannot understand what Paul said in 12 and 15 by dismissing what Paul said in verses 13 and 14:
Romans 11:13-15
12 “Now if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles; how much more their fulness?
13 For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify mine office:
14 If by any means I may provoke to emulation them which are my flesh, and might save some of them.
15 For if the casting away of them be the reconciling of the world, what shall the receiving of them be, but life from the dead?”
Clearly above Paul says his only expectations are that he through the preaching work of the Gentiles, “might save some” of them.”
So what did he mean, “how much more their fulness?” What Paul said in verse 15 is what he meant, “what shall the receiving of them be, but life from the dead?”
He is telling the high-minded Gentiles that just as God seeks to reclaim the fulness of the Gentiles of the flesh, God also seeks to reclaim the fulness of those flesh and blood Israelites, for each one God does reclaim in Christ means life from the dead.
And as Paul said elsewhere: 1 Corinthians 15:39a “All flesh is not the same flesh: but there is one kind of flesh of men, ...”
Where then is the cause that any flesh ought to boast they are God's special people? That is pride which speaks.
Galatians 6:12-18
12 “As many as desire to make a fair shew in the flesh, they constrain you to be circumcised; only lest they should suffer persecution for the cross of Christ.
13 For neither they themselves who are circumcised keep the law; but desire to have you circumcised, that they may glory in your flesh.
14 But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world.
15 For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but a new creature.
16 And as many as walk according to this rule, peace be on them, and mercy, and upon the Israel of God.” (KJV)
Romans 9:8 “...They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.”
Romans 4:16 “Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all..”
Romans 9:11,15,16
11 (For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth
15 For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.
16 So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy.” }]
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Paul could not have told us any plainer concerning that Israel of the flesh, than follows:
Romans 9:27-29 (TNIV)
27 Isaiah cries out concerning Israel: “Though the number of the Israelites be like the sand by the sea,
only the remnant will be saved.
28 For the Lord will carry out his sentence on earth with speed and finality.”
29 It is just as Isaiah said previously: “Unless the Lord Almighty had left us descendants, we would have become like Sodom, we would have been like Gomorrah.”
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Touching back on Romans 11:25-27 more of an explanation, Today's New International Version reads:
Romans 11:25-27
25 I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not think you are superior: Israel has experienced a hardening in part until the full number of the Gentiles has come in,
26 and in this way all Israel will be saved. As it is written: “The deliverer will come from Zion;
he will turn godlessness away from Jacob.
27 And this is my covenant with them when I take away their sins.”
A Manual Greek Lexicon of the New Testament [Edinburgh, 1937, G. Abbott-Smith, p. 329] defines hou'tos as meaning “in this way, so, thus.”)
What we want to take particular notice of is that this saving of “all Israel” is accomplished, not by conversion of all the Jews, but by the ‘coming in’ of people from Gentile nations. Thus the phrase, “in this way”, is linked to the thought, “until the full number of the Gentiles has come in.”
Why would that be so? For two obvious reasons:
In verses 2-5 Paul clearly shows it to be the remnant of Israel he knows are yet there and will be saved, but Paul has no idea how many that will be. So in verse 28 Paul tells us that “as concerning the gospel, (that is, as concerning their need to be preached to), they are enemies for your sakes: but as touching the election (that is, as it relates to God's election of a remnant of them), they are beloved for the fathers' sakes.” In other words, for the sake of the promises God made to the fathers God will salvage as many as will allow it. Paul did not know how many that would be. Paul said clearly he hoped only that some might be saved.
Paul showed how they would be saved in verses 13,14,30,31, as also at Romans 10:12-15, by the preaching work done by the Gentiles, which is why Paul was seeking to break the Gentiles of their high-mindedness. Thus the saving of “all Israel” is accomplished, not by conversion of all the Jews, but by the ‘coming in’ of people from Gentile nations. Their preaching would give God something to pick away at their blindness with. But God will force no one.
Remember: Romans2:28,29 “He is not a Jew who is one on the outside, nor is circumcision that which is on the outside upon the flesh. But he is a Jew who is one on the inside, and his circumcision is that of the heart by spirit, and not by a written code.”
And remember: Romans 9:6 “Not all who spring from Israel are really 'Israel'.”
It is only Israel by spirit that is God's Israel. Israel, meaning “clinger with God”, by the spirit of faith in Jesus Christ, our mentor of the righteousness of God.
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All things under that Old Law Covenant were prophetic foreshadows of something greater in Christ, including that Old Law Covenant's people. We see that Abraham, Isaac and Jacob were all used by God to prophetically foreshadow things concerning Christ. Why then not all fleshly Israel?
Abraham is the father of the faith that God recognizes. As such he is a picture of God who gives faith.
Isaac is the picture of the Christ the Son of God, made to be born to Sarah's womb well beyond child-bearing years, even as God by His holy spirit made Mary conceive Jesus.
And Jacob is the prophetic foreshadow of Jesus the Son of Man who would multiply seed in this earth to God, the Father, as represented by Abraham.
John 12:23-24
23 “And Jesus said to them in answer, The hour of the glory of the Son of man has come.
24 Truly I say to you, If a seed of grain does not go into the earth and come to an end, it is still a seed and no more; but through its death it gives much fruit.”
And as we put on the new man in Christ we are letting God shape our hearts so as to turn away ungodliness from Jacob.